Abstract: A window assembly comprising a frame which holds a window pane, which window assembly comprises at least one cleaning device for cleaning a surface of the window pane and drive means for moving the cleaning device in a direction of movement over the window pane surface, wherein the cleaning device has a dimension which at least substantially corresponds to the dimension of the window pane in a transverse direction perpendicular to the direction of movement, wherein the cleaning device comprises at least one rotary body, which is rotatable about an axis of rotation parallel to the transverse direction, to which rotary body at least one lip and at least one cleaning element are connected, so that the lip and the cleaning element are alternately brought into contact with the window pane upon rotation of the rotary body.